afraid  
adjective uk/əˈfreɪd/ us/əˈfreɪd/
  (FEAR)      
 A2 [ after verb ]畏惧的,害怕的;担忧的,发愁的 
feeling fear, or feeling worry about the possible results of a particular situation
  He was/felt suddenly afraid. 他突然害怕起来/感到恐惧。 
 I've always been afraid of flying/heights/spiders. 我一直都怕坐飞机/恐高/怕蜘蛛。 
 She was afraid for her children (= feared that they might be hurt). 她很担心孩子们的安全。 
 [ + to infinitive ] Don't be afraid to say what you think. 不要害怕说出自己的想法。 
 [ + (that) ] She was afraid (that) he might be upset if she told him. 她担心告诉他之后他会不高兴。 
 - More examples
 - She's afraid of being attacked if she walks across the park.
 - He wasn't afraid to stand up to bullies.
 - The government is afraid of further serious rioting today.
 - Being afraid of the dark, she always slept with the light on.
 - Don't go up the tower if you're afraid of heights.
 
  (SORRY)     
I'm afraid...A2 (用来委婉地说出不好的消息或者反对意见)恐怕,很遗憾,对不起,抱歉
used to politely introduce bad news or disagreement
  This is your room - it's rather small, I'm afraid. 这是你的房间——恐怕是太小了点儿。 
 I don't agree at all, I'm afraid. 对不起,我完全不能同意。 
 I'm afraid you've completely misunderstood the question. 恐怕你完全误解了这个问题。 
 [ + (that) ] I'm afraid (that) we can't come this evening after all. 很遗憾,我们今天晚上终究还是来不了了。 
 "Was she impressed with our work?" "I'm afraid not (= no)." “她赞赏我们的工作吗?”“恐怕并非如此。” 
 "Does this mean I've got to leave?" "I'm afraid so." (= Yes.) “这是不是意味着我必须得离开了?”“恐怕是这样。”